A light coupling method for light emitting submodule

Abstract

The present invention provides a light coupling method for an optical emission submodule, wherein the optical emission submodule includes a laser, a collimating lens for collimating the light emitted by the laser, a displacement prism for translating the collimated light, a converging lens for coupling the collimated light emitted from the displacement prism into an optical fiber adapter, and an optical fiber adapter; the coupling of the optical emission submodule includes the following process: while coupling the converging lens, adjusting the angle of the displacement prism in the horizontal plane to translate the collimated light path, so that the light emitted from the converging lens enters the optical fiber end face of the optical fiber adapter at the best incident angle. The invention adjusts the angle of the displacement prism in the horizontal plane while coupling the converging lens, so that the actual collimated light path and the designed collimated light path overlap as much as possible, so that the light emitted from the laser enters the optical fiber end face of the optical fiber adapter at the best incident angle, thereby improving the coupling efficiency of the optical emission submodule.

Description

Technical Field

[0001] The invention belongs to the technical field of optical communication, and in particular relates to a light coupling method of an optical transmission submodule. Background Art

[0002] With the development of the optical communication industry, the data traffic that needs to be transmitted is increasing, the demand for optical modules is also increasing, and at the same time, higher and higher requirements are placed on the optical power coupling of optical modules. Therefore, how to improve the coupling efficiency of the optical transmission submodule of the optical module is becoming more and more important. Summary of the invention

[0003] The object of the present invention is to provide a light coupling method for an optical transmission sub-module, which can at least solve some of the defects existing in the prior art.

[0004] To achieve the above object, the present invention adopts the following technical solution:

[0005] A light coupling method for an optical emission submodule, wherein the optical emission submodule comprises a laser, a collimating lens for collimating the light emitted by the laser, a displacement prism for translating the collimated light, a converging lens for coupling the collimated light emitted from the displacement prism into an optical fiber adapter, and an optical fiber adapter; the coupling of the optical emission submodule comprises the following process:

[0006] While coupling the converging lens, the angle of the displacement prism in the horizontal plane is adjusted to translate the collimated optical path, so that the light emitted from the converging lens enters the optical fiber end face of the optical fiber adapter at an optimal incident angle.

[0007] Furthermore, a method for determining whether the light emitted from the converging lens enters the optical fiber end face of the optical fiber adapter at an optimal incident angle is as follows: powering on the optical transmission submodule, adjusting the position of the converging lens, and simultaneously adjusting the angle of the displacement prism in the horizontal plane; when the optical power output from the optical fiber adapter reaches a maximum, fixing the positions of the converging lens and the displacement prism.

[0008] Furthermore, there are multiple lasers for emitting light of different wavelengths; there are multiple collimating lenses corresponding one to one with the lasers; the light emission submodule also includes an optical multiplexer, which is arranged between the collimating lens and the displacement prism to synthesize multiple collimated lights from the multiple collimating lenses into one collimated light incident on the displacement prism.

[0009] Furthermore, for the method of determining the positions of the multiple collimating lenses: first adjust one of the collimating lenses to collimate the light emitted by the laser of the corresponding channel and fix the collimating lens, then adjust and determine the positions of the displacement prism and the converging lens, and then determine the positions of the remaining collimating lenses in turn.

[0010] Furthermore, the positions of the plurality of collimating lenses are determined in order from the longest to the shortest optical path.

[0011] Furthermore, the coupling process of the optical transmission sub-module includes the following steps:

[0012] S1. Fix the laser, optical multiplexer and optical fiber adapter on the housing of the optical transmission sub-module device;

[0013] S2, electrically connecting corresponding optical elements in the light emission sub-module;

[0014] S3, power on the light emitting submodule, adjust the position of the collimating lens with the longest optical path, collimate the light emitted by the laser of the corresponding channel, and fix the collimating lens;

[0015] S4, adjusting the position of the converging lens so that the optical power coming out of the optical fiber adapter reaches the maximum, then adjusting the angle of the displacement prism in the horizontal plane so that the optical power coming out of the optical fiber adapter reaches the maximum, fixing the displacement prism, and then adjusting the position of the converging lens again so that the optical power coming out of the optical fiber adapter reaches the maximum, and fixing the converging lens;

[0016] S5. Turn on the remaining lasers in order from the longest optical path to the shortest and adjust the position of the collimating lens corresponding to the laser to maximize the optical power coming out of the fiber optic adapter and fix the position of the corresponding collimating lens.

[0017] Furthermore, in the step S2, the optical elements in the light emission sub-module are electrically connected by gold wire bonding using a gold wire bonding process.

[0018] Furthermore, the optical fiber adapter is provided with an isolator.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The light coupling method of the optical emission submodule provided by the present invention adjusts the angle of the displacement prism in the horizontal plane so that the actual collimated light path and the designed collimated light path overlap as much as possible, so that the light emitted from the laser enters the optical fiber end face of the optical fiber adapter at the optimal incident angle, thereby improving the coupling efficiency of the optical emission submodule.

[0021] The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic diagram of the optical path of the light emitting sub-module in an embodiment of the present invention;

[0023] Figure 2 is a schematic diagram of the optical path of collimated light entering the optical fiber end face of the optical fiber adapter through a converging lens in an embodiment of the present invention;

[0024] Figure 3 is a principle diagram of an optical path for adjusting a displacement prism to change the amount of optical path translation in an embodiment of the present invention;

[0025] Figure 4 It is a principle diagram of an optical path for translating an optical path to change the incident angle of light entering the optical fiber end face of an optical fiber adapter in an embodiment of the present invention.

[0026] Explanation of the reference numerals: 1. Laser; 2. Collimating lens; 3. Optical multiplexer; 4. Displacement prism; 5. Converging lens; 6. Fiber optic adapter. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, a conflicting connection or an integral connection; for ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances; in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0030] like Figure 1 As shown, this embodiment provides a light coupling method for an optical emission submodule, wherein the optical emission submodule includes a laser 1, a collimating lens 2 for collimating the light emitted by the laser 1, a displacement prism 4 for translating the collimated light, a converging lens 5 for coupling the collimated light from the displacement prism 4 into an optical fiber adapter 6, and an optical fiber adapter 6; wherein, preferably, the optical fiber adapter 6 can be provided with an isolator.

[0031] The coupling of the above-mentioned light emission submodule includes the following process: while coupling the converging lens 5, the angle of the displacement prism 4 in the horizontal plane is adjusted to translate the collimated light path, so that the light emitted from the converging lens 5 enters the optical fiber end face of the optical fiber adapter 6 at the optimal incident angle.

[0032] When coupling the collimating lens 2, if the laser 1, the displacement prism 4, and the optical fiber adapter 6 are all mounted and fixed, and only the position of the converging lens 5 is adjusted so that the coupled collimated light is incident on the optical fiber end face of the optical fiber adapter 6, due to the mounting position deviation of the laser 1 and the calibration deviation of the coupling machine, the coupled collimated light will deviate from the theoretically designed collimated light position, and thus the actual collimated light path will deviate from the designed collimated light path (e.g. Figure 2 As shown), this will cause the coupled collimated light to pass through the converging lens 5 and not enter the fiber end face of the fiber adapter 6 at the optimal incident angle, thereby reducing the coupling efficiency.

[0033] In this embodiment, while coupling the converging lens 5, the angle of the displacement prism 4 in the horizontal plane is adjusted to translate the collimated light path, such as Figure 3 As shown in FIG. 1 , for the same incident light, when the displacement prism 4 is rotated counterclockwise by a certain angle, the propagation direction of the outgoing light remains unchanged, but the outgoing light is translated, resulting in a certain offset (i.e., the outgoing light position 1 is translated to the outgoing light position 2 in the figure). When the light emitted from the displacement prism 4 is deflected to a certain extent and enters the optical fiber of the optical fiber adapter 6 through the converging lens 5, as shown in FIG. Figure 4 As shown, specifically, after the incident light passes through the converging lens 5 at position one, it enters the optical fiber at an angle α. When the incident light is translated from position one to position two, the angle at which the incident light enters the optical fiber changes from angle α to angle β. Therefore, by changing the offset of the incident light relative to the optical axis, the angle at which the light enters the optical fiber can be changed. There is an optimal incident angle for light to enter the optical fiber. For example, when the optical fiber end face inside the optical fiber adapter 6 is a 6° bevel, the optimal incident angle from the converging lens 5 to the optical fiber is 2.8°. The smaller the deviation between the angle at which the incident light enters the optical fiber and the optimal incident angle is, the higher the coupling efficiency into the optical fiber is. Therefore, in this embodiment, by adjusting the angle of the displacement prism 4 in the horizontal plane, thereby changing the offset of the incident light relative to the optical axis, and then changing the incident angle of the light entering the optical fiber, the incident angle can be made as close as possible to the designed optimal incident angle, thereby improving the coupling efficiency of the light entering the optical fiber.

[0034] In some embodiments, a method for determining whether the light emitted from the converging lens 5 enters the optical fiber end face of the optical fiber adapter 6 at an optimal incident angle is as follows: power on the optical emission submodule, adjust the position of the converging lens 5, and simultaneously adjust the angle of the displacement prism 4 in the horizontal plane. When the optical power output from the optical fiber adapter 6 reaches a maximum, the angle at which the incident light enters the optical fiber inside the optical fiber adapter 6 deviates minimally from the designed optimal incident angle. At this time, the positions of the converging lens 5 and the displacement prism 4 are fixed.

[0035] For the high-speed light emission submodule, there are multiple lasers 1 for emitting light of different wavelengths; there are multiple collimating lenses 2, corresponding to the lasers 1 one by one, for collimating the light emitted by the multiple lasers 1, and an optical multiplexer 3 is also arranged between the collimating lenses 2 and the displacement prism 4, for synthesizing the multiple collimated lights from the multiple collimating lenses 2 into one collimated light incident on the displacement prism 4. The method for coupling and determining the positions of the multiple collimating lenses 2 in the high-speed light emission submodule is as follows: firstly adjust one of the collimating lenses 2 to collimate the light emitted by the laser 1 of the corresponding channel and fix the collimating lens 2, and then adjust and determine the positions of the displacement prism 4 and the converging lens 5 in accordance with the above-mentioned coupling converging lens 5 while adjusting the angle of the displacement prism 4 in the horizontal plane to translate the collimated light path, and then adjust and determine the positions of the displacement prism 4 and the converging lens 5, and then adjust the positions of the remaining collimating lenses 2 in sequence after fixing the positions of the displacement prism 4 and the converging lens 5 to determine the positions of the respective collimating lenses 2.

[0036] Preferably, the positions of the plurality of collimating lenses 2 are determined in order from the longest to the shortest optical path.

[0037] The following is an example of the coupling process of a 400G optical transmission submodule. The optical transmission submodule includes four lasers 1, four collimating lenses 2, an optical multiplexer 3, a displacement prism 4, a converging lens 5 and a fiber adapter 6. The coupling process includes the following steps:

[0038] S1. Fix four lasers 1, an optical multiplexer 3, and an optical fiber adapter 6 on the housing of an optical transmission sub-module device.

[0039] S2. Use gold wire bonding technology to bond gold wires to the light emitting sub-module to complete electrical connection.

[0040] S3, power on the light emitting submodule, adjust the collimating lens 2 (i.e. Figure 1 The collimating lens at the bottom of the image is positioned so that the laser 1 of the corresponding channel (i.e. Figure 1 The light emitted by LD4) is collimated and fixed in the collimating lens 2.

[0041] S4. Adjust the position of the converging lens 5 so that the optical power coming out of the optical fiber adapter reaches the maximum, then adjust the angle of the displacement prism 4 in the horizontal plane so that the optical power coming out of the optical fiber adapter 6 reaches the maximum, fix the displacement prism 4, and then adjust the position of the converging lens 5 again so that the optical power coming out of the optical fiber adapter 6 reaches the maximum, and fix the converging lens 5.

[0042] S5. Power on the optical transmitter module and turn on Figure 1 The second laser LD3 from bottom to top, and adjust the corresponding collimating lens 2 (i.e. Figure 1 The second collimating lens from bottom to top in the middle) is positioned so that the optical power coming out of the optical fiber adapter 6 reaches the maximum. At this time, the position of the collimating lens 2 is fixed.

[0043] S6. According to step S5, the remaining two lasers 1 are turned on in sequence to complete the coupling of the remaining two collimating lenses 2, and the positions of the two collimating lenses 2 are fixed.

[0044] In the coupling process of the above-mentioned light emission sub-module, each collimating lens 2, displacement prism 4, and converging lens 5 are fixed by UV glue. After all optical elements are coupled, the coupled products are placed in an oven to bake and cure the UV glue to fix each optical element.

[0045] The above examples are merely illustrative of the present invention and do not constitute a limitation on the protection scope of the present invention. All designs that are the same or similar to the present invention fall within the protection scope of the present invention.

Claims

1. A light coupling method for a light emitting submodule, characterized in that: The light emission submodule includes a laser, a collimating lens for collimating the light emitted by the laser, a displacement prism for translating the collimated light, a converging lens for coupling the collimated light emitted from the displacement prism into the optical fiber adapter, and an optical fiber adapter; the coupling of the light emission submodule includes the following process: While coupling the converging lens, the angle of the displacement prism in the horizontal plane is adjusted to translate the collimated optical path, so that the light emitted from the converging lens enters the optical fiber end face of the optical fiber adapter at an optimal incident angle.

2. The light coupling method of the light transmitting sub-module as claimed in claim 1, characterized in that: The method for judging whether the light emitted from the converging lens enters the optical fiber end face of the optical fiber adapter at the optimal incident angle is as follows: power on the optical transmission submodule, adjust the position of the converging lens, and simultaneously adjust the angle of the displacement prism in the horizontal plane; when the optical power output from the optical fiber adapter reaches the maximum, fix the positions of the converging lens and the displacement prism.

3. The light coupling method of the light transmitting sub-module according to claim 1 or 2, characterized in that: There are multiple lasers for emitting light of different wavelengths; there are multiple collimating lenses corresponding to the lasers one by one; The light emission submodule further includes an optical multiplexer, which is disposed between the collimating lens and the displacement prism to synthesize multiple collimated lights from a plurality of collimating lenses into one collimated light incident on the displacement prism.

4. The light coupling method of the light transmitting sub-module as claimed in claim 3, characterized in that: The method for determining the positions of the multiple collimating lenses is as follows: firstly adjust one of the collimating lenses to collimate the light emitted by the laser of the corresponding channel and fix the collimating lens, then adjust and determine the positions of the displacement prism and the converging lens, and then determine the positions of the remaining collimating lenses in turn.

5. The light coupling method of the light transmitting sub-module as claimed in claim 4, characterized in that: The positions of the plurality of collimating lenses are determined in order of their optical path length from long to short.

6. The light coupling method of the light transmitting sub-module as claimed in claim 3, characterized in that: The coupling process of the optical transmission sub-module includes the following steps: S1. Fix the laser, optical multiplexer and optical fiber adapter on the housing of the optical transmission sub-module device; S2, electrically connecting corresponding optical elements in the light emission sub-module; S3, power on the light emission submodule, adjust the position of the collimating lens with the longest optical path, collimate the light emitted by the laser of the corresponding channel, and fix the collimating lens; S4, adjusting the position of the converging lens so that the optical power coming out of the optical fiber adapter reaches the maximum, then adjusting the angle of the displacement prism in the horizontal plane so that the optical power coming out of the optical fiber adapter reaches the maximum, fixing the displacement prism, and then adjusting the position of the converging lens again so that the optical power coming out of the optical fiber adapter reaches the maximum, and fixing the converging lens; S5. Turn on the remaining lasers in order from the longest optical path to the shortest and adjust the position of the collimating lens corresponding to the laser to maximize the optical power coming out of the fiber optic adapter and fix the position of the corresponding collimating lens.

7. The light coupling method of the light transmitting sub-module as claimed in claim 6, characterized in that: In the step S2, the optical elements in the light emission sub-module are electrically connected by gold wire bonding using a gold wire bonding process.

8. The light coupling method of the light transmitting sub-module as claimed in claim 1, characterized in that: The optical fiber adapter is provided with an isolator.

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